Display device



N. KRAWITZ DISPLAY DEVICE Oct. 8, 1929.

Filed Sept. 1927 3 Sheets-Sheet EH11 Enfi H150 n n |1E HUT] EnEnEn wfw l I Nathan Krawz'i him/W U ATTORNEY N. KRAWITZ DISPLAY DEVICE Filed Sept. v, 1927 Oct. 8, 1929.

3 Sheets-Shget 5 INVENTORI Na fix an [Frau/6 ATTORNE Y.

Patented Oct. 8, 1929 PATENT OFFICE NATHAN KRAWITZ, OF PHILADELPHIA, PENNSYLVANIA DISPLAY DEVICE Application filed September 7, 1927. Serial No. 217,895.

My invention relates to display devices and more particularly to a device having a rotatable platform upon which articles may be placed so that they may be viewed from i '5 all sides.

The principal object of my invention is to provide a device of this character which will revolve uniformly and smoothly and which is so designed that there is little likelihood of its getting out of order. I

Another object of my invention is to so construct the device that it is inexpensive to manufacture and will require but very little motive power.

Still another object is to utilize an improved type of gear and to apply the motive power at the periphery of the revolving member. I

The mechanism by which the above ob- 2O jects are accomplished consists of a base with a platform rotatably mounted relative there-- to and driving means for the platform in cluding a gear meshing with the apertures in a band secured to the platform.

Figure 1 is a top plan view of a display device embodying my invention, certain parts.

being broken away, and- Figure 2 a rear VleW thereof. Flgure 3 1s an enlarged fragmentary crosssectional view, taken on line 3-3 on Figure 1, and

Figure 4 a cross-sectional view taken on line 14 on Figure 1.

Figure 5 is a front View of the device shown in Figure 1, and

Figure 6 a top plan view of the base, showing the motor support and bearings thereon only.

Referring now in more detail to the draw ings, the device has been shown as having a base 10 provided with a central boss 11 which is bored to form a bearing 12 for the main shaft of the device. The main part of base 10 resembles a sector of a circle and has an arm 13 and a web 14 formed integral therewith and extending from boss 11 outwardly; web 14 being formed integral with one side of boss 11 so that a light but rigid base is thus produced.

I Two blocks 15 abut the sides of arm 13 and the straight sides of the main part of base 10 and are provided with arcuate outer edges so that, when assembled, base 10 and blocks 15 are circular in outline, as plainly shown in Figure 6. Base 10 is preferably made of metal, in order to provide weight at the bottom of the display device and the desired strength and rigidity, while blocks 15 may be made of any desired material. A strap 16 overlaps the meeting edges of blocks 15 and is secured to the blocks in any suitable manner so as to prevent their moving away from one another.

A motor base 17, which rests on base 10 and may be secured thereto by bolts 18 or in any other suitable manner, supports a motor 19' which has been shown as being secured thereto by bolts20. An extension 21 is formed on one end of motor base 17 and has a boss 22 formed integral therewith and provided with a bore 23 in which the stem 24 of a worm hearing 25 is supported. A worm 26 is fixed to or formed on shaft 27, which is connected to or forms a part of the armature shaft of motor 19, and is rotatably mounted in worm bearing 25.

p A boss 28 is also formed on extension 21 and providedwith a bore 29 having a hardened metal disk 30 in its bottom which is adapted to support a shaft 31; the bottom of shaft 31 preferably being conical in order to reduce the friction caused by rotating the shaft. A worm wheel 32 is fixed to shaft 31 and meshes with worm 26 so that rotation. of motor 19 will cause rotation of shaft 31; the 8 shaft being lubricated by oil introduced into bore 29 through a duct 33 having an L fitting 3 1 threaded therein and provided with an oil cup 35. WVorm 26 is lubricated by oil drawn I from duct 33 through a wick 24 centrally disposed in stem 24 and contacting with the periphery of the worm.

A sprocket wheel 36 is fixed to the upper, end of shaft 31 and is encircled by a sprocket chain 37 which also encircles a sprocket 38 fixed to a shaft 39 rotatably mounted in a bearing 10 adjustably secured to base 10 by bolts tl'passsing through slots 42 formed in the base of bearing 4 0. The lower end of shaft 39 is preferably conical and adapted to rest upon a hardened metal disk 43, in order to reduce the friction caused by the rotation of the shaft, and lubrication is provided by means of an oil cup 44 carried by an L fitting 45 threaded into the side of bearing 40 and communicating with its bore.

A hardened metal disk 46 rests in the bottom of bearing 12 and supports a main shaft 47 which also is preferably provided with a conical lower end and lubricated by oil fed from an oil cup 48 through a pipe 49 to the interior of bearing 12. A wheel 50, fined to the upper end of shaft 47, is undercut along its lower edge so as to receive a band 51 provided with a plurality of spaced slots 52, meshing with which is gear wheel 53 fixed to the upper end of shaft 39.

Vhile an internal gear may be used for this purpose, I find that the above construction is much cheaper and fully as satisfactory. The strips from which bands 51 are made may be punched on a rack punch, out to length, and the ends spliced together by a small splice plate 54.

The radius of wheel is slightly less than the radius of base 10 so that it may rotate inside of a sign 55 which is secured to the outer edges of blocks 15. Sign 55 may be made in any desired manner but has been shown as consisting of an inner piece 56, made of opaque material and having letters 57 cut therethrough, and an outer piece 58 of transparent or translucent material so that, when the interior of the device is illuminated as by means of electric lamps 59,, the letters stenciled in piece 56 will show through piece 58, as shown in Figure 5.

A platform '60, of the same diameter as wheel 50, rests upon this wheel and is adapted to support various articlesof merchandise 61; it being held against lateral movement in any desired manner, as by providing it with a central bore 62 into which the upper end of shaft 47 extends.

In using the device, it is placed with sign 55 facing the street or the place from which the articles are to be viewed; display of articles, are arranged on platform and motor 19 furnished with electrical power so that it may rotate'platform 60 through worm 26, worm wheel 32, sprocket Wheel 36, chain 37, sprocket 38, gear wheel 558, band 51, and wheel 50.

The ratios between the worm and worm wheel and between the sprockets may be so regulated as to rotate platform 60 at any desired speed. Due to the device being worm driven, and the motive power applied at the periphery of the rotatable member, its speed of rotation is uniform and constant. The device is simple and requires absolutely no attention over long periods of operation and, when made as above described, can be produced at a relatively low cost.

It is to be understood that the embodiment an article, or

1 erein illustrated and described is illustrative of the invention and that variations in the details thereof may be made without departing from the scope of the invention as hereinbefore set forth and hereinafter claimed.

1 claim:

1. In a display device having a rotatable platform, a base part shaped like a sector of a circle, an arm formed integral with the base part and extending radially therefrom, blocks fit d between the arm and the sides of the base part and shaped to complete the circle of which the base part is a sector, and a sign secured to the outer edges of the blocks and extending upwardly in front of the platform.

2. A display device including a base having an arm, a bearing at the junction of the base and arm, a main shaft rotatable therein, a wheel on the shaft, a platform on the wheel, a band secured to the wheel and having a plurality of spaced apertures, a hear ing on the base, a drive shaft rota-table therein, a gear on the drive shaft meshing with tie apertures in the band, a sprocket on the drive shaft, a worm wheel shaft rotatable on the base, a sprocket thereon, a chain connecting the sprockets, a worm wheel on the worm'wheel shaft, a motor on the base, an armature shaft in the motor, and a worm secured to the armature shaft and meshing with the worm wheel.

in testimony whereof I have signed my name to this specification.

NATHAN'IKRAWITZ. 

